Method for determining content of Ir in gold jewelry by microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)

An ICP-AES, microwave digestion technology, applied in the preparation of test samples, thermal excitation analysis, material excitation analysis, etc., can solve problems such as insoluble, overcome doping problems, reduce human errors, and use less reagents Effect

Inactive Publication Date: 2014-10-01
NAT GOLD & DIAMOND TESTING CENT
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

It is difficult to dissolve completely by using general sample dissolution methods. Although analytical chemists at home and abroad have co

Method used

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  • Method for determining content of Ir in gold jewelry by microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)
  • Method for determining content of Ir in gold jewelry by microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)
  • Method for determining content of Ir in gold jewelry by microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Experimental part

[0027] Instruments and reagents

[0028] Italian MILESTONE ETHOSA microwave digestion instrument; American Thermo IRIS Intrepid II inductively coupled plasma emission spectrometer; American Denver T-214 electronic balance. HNO 3 (excellent pure); HCl (excellent pure); H 2 o 2 (Excellent grade pure); Experimental water is secondary deionized water; Ir standard stock solution series: 1000ppm, Beijing Nanke Analytical Instrument Co., Ltd.; The sample used is iridium-doped gold jewelry, purchased from a certain market in Jinan.

[0029] Microwave Digester Working Conditions

[0030] This study adopts a step-by-step digestion method to overcome the defects of small volume and low pressure of the sample digestion tank, to ensure the complete digestion of the sample, and to avoid the use of hydrofluoric acid used in previous related studies, so that subsequent samples can be directly injected .

[0031] The first step of digestion process: Take the de...

Embodiment 2

[0062] In 1.2, the first step of digestion process: take a debris sample, accurately take about 0.0500g,

[0063] Table 1 Working conditions of microwave digestion samples in the first step

[0064]

[0065] Table 2 Working conditions of microwave digestion samples in the second step

[0066]

[0067] 2.2 During the drawing of the standard curve, draw the standard stock solution of the Ir element and dilute it with 5% nitric acid to form a standard series of 0.0, 1.0, 2.0, 5.0 mg / L (the above concentrations can be adjusted as required) Others are the same as in Example 1 same.

Embodiment 3

[0069] In 1.2, the first step of digestion process: take a debris sample, accurately take about 0.1500g,

[0070] Table 1 Working conditions of microwave digestion samples in the first step

[0071]

[0072] Table 2 Working conditions of microwave digestion samples in the second step

[0073]

[0074] 2.2 During the drawing of the standard curve, draw the standard stock solution of the Ir element and dilute it with 5% nitric acid to form a standard series of 0.0, 1.0, 2.0, 5.0 mg / L (the above concentrations can be adjusted as required) Others are the same as in Example 1 same.

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Abstract

The invention relates to a method for determining the content of Ir in gold jewelry by microwave digestion ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). The method comprises the following steps: preparing a digestion reagent, performing digestion step by step, testing by an ICP-AES instrument, drawing a standard curve, and testing in parallel according to the steps to obtain an average value. The method for determining the content of Ir in gold jewelry by microwave digestion ICP-AES takes HNO3, HCl and H2O2 as solvents and adopts step-by-step digestion, so that the Ir dissolving rate is high, and the complete digestion of a sample is achieved; the method is applied to practice, and obtains a satisfied result.

Description

(1) Technical field [0001] The invention belongs to a method for detecting Ir content, and relates to a microwave digestion ICP-AES method for measuring Ir content in gold jewelry. (2) Background technology [0002] The chemical treatment of precious metal Ir in gold jewelry is a time-consuming and difficult step in the analysis of precious metals. It is difficult to completely dissolve the sample by general sample dissolution methods. Although analytical chemists at home and abroad have conducted long-term and comprehensive research, there are still many problems in the dissolution rate and degree of dissolution of the sample. Obviously, solving this technical problem has important scientific significance and economic value for shortening the overall analysis process and accurately and comprehensively examining the content of precious metal elements and impurities in samples. (3) Contents of the invention [0003] In order to make up for the deficiencies in the prior art...

Claims

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Application Information

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IPC IPC(8): G01N1/44G01N21/71
Inventor 刘晓伟张凤霞程佑法马永山张惠
Owner NAT GOLD & DIAMOND TESTING CENT
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